The action potential Depolarization Repolarization Reestablishing resting potential + + + Nat Na+ K* Kt + + membrane (mV) A stimulus at this time causes a quick rise in membrane potential. membrane (mV) The membrane potential drops rapidly, overshooting its initial value. Δν Δν, Δν, membrane (mV) Diffusion of ions reestablishes the +40- +40- +40- -t (ms) 3 t (ms) 3 resting potential. t (ms) 3 2. 2 1 -70- -70- -70- A cell depolarizes when a stimulus causes the opening of the sodium channels. The concentration of sodium ions is much higher the cell drives these ions out of the cell. The outside the cell, so positive sodium ions flow into the cell, rapidly raising its potential to 40 mV, at which point the The reestablishment of the rest- ing potential after the sodium and potassium channels close is a relatively slow process controlled by the motion of ions across the membrane. The cell repolarizes as the potassium channels open. The higher potassium concentration inside potassium channels close when the membrane potential reaches about -80 mV, slightly less than the resting potential. sodium channels close.
The action potential Depolarization Repolarization Reestablishing resting potential + + + Nat Na+ K* Kt + + membrane (mV) A stimulus at this time causes a quick rise in membrane potential. membrane (mV) The membrane potential drops rapidly, overshooting its initial value. Δν Δν, Δν, membrane (mV) Diffusion of ions reestablishes the +40- +40- +40- -t (ms) 3 t (ms) 3 resting potential. t (ms) 3 2. 2 1 -70- -70- -70- A cell depolarizes when a stimulus causes the opening of the sodium channels. The concentration of sodium ions is much higher the cell drives these ions out of the cell. The outside the cell, so positive sodium ions flow into the cell, rapidly raising its potential to 40 mV, at which point the The reestablishment of the rest- ing potential after the sodium and potassium channels close is a relatively slow process controlled by the motion of ions across the membrane. The cell repolarizes as the potassium channels open. The higher potassium concentration inside potassium channels close when the membrane potential reaches about -80 mV, slightly less than the resting potential. sodium channels close.
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Chapter1: Units, Trigonometry. And Vectors
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Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A 9.0-nm-thick cell membrane undergoes an action potential that follows the curve in the table given. What is the strength of the electric field inside the membrane just before the action potential and at the peak of the depolarization?
Transcribed Image Text:The action potential
Depolarization
Repolarization
Reestablishing resting potential
+
+
+
Nat
Na+
K*
Kt
+
+
membrane (mV) A stimulus at this time
causes a quick rise in
membrane potential.
membrane (mV) The membrane potential
drops rapidly, overshooting
its initial value.
Δν
Δν,
Δν,
membrane
(mV)
Diffusion of ions
reestablishes the
+40-
+40-
+40-
-t (ms)
3
t (ms)
3
resting potential.
t (ms)
3
2.
2
1
-70-
-70-
-70-
A cell depolarizes when a stimulus causes
the opening of the sodium channels. The
concentration of sodium ions is much higher the cell drives these ions out of the cell. The
outside the cell, so positive sodium ions
flow into the cell, rapidly raising its
potential to 40 mV, at which point the
The reestablishment of the rest-
ing potential after the sodium and
potassium channels close is a relatively
slow process controlled by the motion
of ions across the membrane.
The cell repolarizes as the potassium channels
open. The higher potassium concentration inside
potassium channels close when the membrane
potential reaches about -80 mV, slightly less
than the resting potential.
sodium channels close.
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